Method of making inner tubes for pneumatic tires.



Y J. H. BROWN.

Y METHOD OF MAKING INNER TUBES FOR PNEUMATIC TIRES.

APPLICATION FILED NOV- 26, I915- v -Pa'tented Feb. 27, 1917.

ASSIGNOR METHOD or MAKING INNER TUBES FOR PNEUMAirIo'rmE's;

To all whom it may concern: Be it known that I, JOH H. BROWN, a a citizen of the United States, and resident of West Hoboken, in the county of Hudson ber tube having that tread of the tire in. which it is to-be used.

and State of New Jersey, have invented a new and useful Method of Making Inner Tubes for Pneumatic Tires, following is a specification.

My invention relates to a method of making inner tubes the object in view .of providing an all rub- ,portion toward the under a normal compression when the tube is inflated, so that a puncture made bya nail or other article or substance will seal itself when the apuncturing. article or sub stance is withdr vn.

-Apparatus for carrying the method into 7.

practical effect is represented in the accompanying drawings in which,

Figure 1 is a view in perspective of a tube in position on'a mandrel, the tube being partially broken away, and

Fig. 2 is a view of thecompleted tube with end-s connected and inflated. The mandrel on which up or on which it is placed after being built up on a straightmandrel and before it is vulcanized, 's denoted by 1, and consists of a spiral the diameter-of a coil of which is tion, the saidtube 1s, to be opened out,'ends ,mandrel are shown materially less than the diameter "of the completed tube In the present instance nearly two coils of and the tube thereon,

denoted by 2,; is to be vulcanized in the form of these two coils, and after vulcanizae v Specification of Letters Patent.

Application filed November 26, 1915. s rial No. 63,543,

of which the for pneumatic tires, with 'tudinal compression, portion of the tread and the completed tube,

the completed tube, turning the" tube is built 7 tube inside out to place its tread under when the latter is inflated.

Patented Feb. 27, 1917,,

connected and inflated into the form of thesingle annulus shown in Flg. '2

The tube 2 is preferably built up with its; 5 portion 3 which is to when inflated, will be so far as, ordinary I hat I claim is:

The method of making an inner tube for pneumatic, tires, consisting 'in vulcanizing the built up tube in the form of a curve punctures fron'rnails and the like, self-sealv UNITED srra'rns PATENT orr on JOHN H. BROWN, or WEST I-IOBOKEN, NEW JERSEY,

ragile. BoNNEn, or CHAMPAIGN, ILLINOIS.

the tube, p'articuhaving a' sharper pitch than the curve of the vulcanized lateral compression and finally opening out thevulcanized and turned tube and connecting its ends to place the tread portion under longitudinal compression when the tube -is inflated,

In testimony that I claim the foregoing as my invention I have-signed 'my name this 18th daywof November 1915.

JOHN. it'niiowNfi 

